Briefing NotesCalifornia enacts the nation’s first “frontier AI” safety law under SB 53, championed by Gov. CALIFORNIA – Governor Gavin Newsom signed Senate Bill 53 on Monday, formally enacting the Transparency in Frontier Artificial Intelligence Act (TFAIA). Framed as a “trustworthy AI” measure, the law mandates new transparency, safety, and accountability obligations on developers of large frontier models. The bill, authored by Senator Scott Wiener (D-San Francisco), creates five pillars of regulation: transparency, innovation, safety, accountability, and responsiveness. Opponents argue this effectively compels companies to reveal proprietary methodologies, which may qualify as trade secrets under the California Uniform Trade Secrets Act (CUTSA).